Device for reducing piston slap in internal-combustion engines



April 23, 1929. D. M. SSOLENBERGER DEVICE FOR REDUCING PISTON SLAP IN INTERNAL COMBUSTION ENGINES Filed July 12, 1928 untoz Jean M. Salefib7 r attozouqo mit rocking.

Patented Apr. 23,1929.

J 1,710,27 PATENT Y OFFICE.

nnAIw M. SOLENBERGER, or CLEVELAND, OHI0,1 ASSIGN0R 'ro THE SIMPLEX PISTON RING COMPANY or AMERICA INC., A CORPORATION or 01:10.

DEVICE Iron REDUCING PISTON sLAr Application filed July 12,

In the present state of the art one method for lessening piston slap occasioned by a loose fitting piston in a cylinder is to resiliently press one side of the piston against one wall of the cylinder. Inasmuch, however, as the radius of thecurve of the piston is less than that of the cylinder there is but a single line of contact. which permits of a rocking movement.

avoid such rocking movement by a con struction in which there are spaced bearings for the piston against the cylinder wall together with means for holding the piston in contact with said bearings. .To this end the invention consists in the construction as hereinafter set forth.

In the drawings; v

Figure 1 is a sectional side elevation of a piston and cylinder of my improved construction.

Figure 2 is a horizontal section on line 2 2 of Figure 1 and 7 Figure-3 is a similar View with the ring and expander removed. I c 1 A is a cylinder and B is a loose fitting piston therein. C is a ring groove in the piston. D is a ring in said groove and E is a ribbon expander or other suitable means for pressing the ring D against the cylinder walls with a preponderance of pressure in one direction preferably along the axle of the wrist pin.

With the construction as thus far describedthe piston B would be forced into contact with one wall of the cylinder'but only along a single line which would-per- I have therefore relieved or slightly cut away the surface of the piston in the center and for some distance on'opposite sides of the line of pressure as indicated at Fso as to produce spaced lines of contact G and G at opposite ends of the, relieved portion. Thus when the ring and expander are in position the preponderance of pressure of the expander will force the piston against the contact lines G, G. This will prevent any rocking movement as well as maintaining contact in all of the various angular positions of the connecting rod.

In addition to this function of preventing slap my improved construction has the It is the ob ect of the present invention to IN INTERNAL-COMBUSTION enemas.

1928. Serial No. 292,122.

additional advantage of maintaining a good heat conducting contact between. the skirt of the piston and the Walls of the cylinder so as to facilitate the distribution of heat in the head. To facilitate the installation fof the pistons in the cylinders the former are preferably relieved or cut away on diametrically opposite sides as indicated at F and F so as to permit of pressing the piston against eitherv Wall of the cylinder along the axis of the wrist pin.

In the construction of pistons, it is usual to relieve the diameter ofthe portions formmg the lands for the piston rings so as to I prevent contact with the wall of the cylinder, and to avoid danger of scoring. With my improved construction it is advantageous to permit the lands to come into fullcontact with the cylinder wall in the lines of contact of the skirt portion. This has the advantage of permitting greater transference of heat from the hottest portions of the piston due to the substantial metal to metal I contact of the lands with the cylinder wall.

What I claim as my inventions is: 1. The combination with a cylinder and a loose fitting piston'therein, of means for establishing spaced lines of contact between 30 said piston and cylinder on one side of the axes thereof and means for pressing said piston against said cylinder along said lines of contact.

2. The combination with a cylinder and a loose fitting piston therein, of means for establishing spaced lines of contact between said piston and cylinder on one side of the axes thereof and resilient-means for pressing said piston in a direction intermediate said spaced hearings to maintain contact with the cylinder.

3. The combinatlon with a cylinder, of a loose fitting piston therein, having a portion of its surface relieved of cut away to form spaced lines of contact with the cylinder, a ring fitting a ring groove in said piston and means'for resiliently pressing said ring in a direction intermediate and opposite to said relieved portion to maintain said spaced lines of contact between said piston and cylinder.-

In testimony whereof I afiix my signature.

DEAN SOLENBERGER. 

